318-3 Closed Chamber Truck Heads

318willrun said
Can I ask why you would want to use those heads? I get close chamber heads raise compression, but close chamber heads don't flow as well, and that old of head would not have hardened seats.

My 2 cents...........

As a head off a medium/heavy duty 318, it would make perfect sense that they would have hardened exhaust seats, maybe even stelite inserts